When investigators from the attorney general's office went to Diehl's home Tuesday with a search warrant, he told them he had viewed child pornography three times a week for a decade, court papers say.

Authorities began focusing on Diehl in April as part of an online investigation during which they identified his Internet protocol address as one associated with three child pornography files that had been shared, according to court papers.

After issuing a subpoena to obtain information about the Internet address, investigators identified Diehl as the Internet user tied to the address, court papers say.